WO2004066189B1 - Methods of calibrating an imaging system using calibration beads - Google Patents

Methods of calibrating an imaging system using calibration beads

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Publication number
WO2004066189B1
WO2004066189B1 PCT/US2004/001116 US2004001116W WO2004066189B1 WO 2004066189 B1 WO2004066189 B1 WO 2004066189B1 US 2004001116 W US2004001116 W US 2004001116W WO 2004066189 B1 WO2004066189 B1 WO 2004066189B1
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Prior art keywords
flow
imaging system
fluid
objects
flow imaging
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PCT/US2004/001116
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French (fr)
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WO2004066189A2 (en
WO2004066189A3 (en
Inventor
William Ortyn
David Basiji
Keith Frost
Brian Hall
Michael Seo
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Amnis Corp
William Ortyn
David Basiji
Keith Frost
Brian Hall
Michael Seo
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Application filed by Amnis Corp, William Ortyn, David Basiji, Keith Frost, Brian Hall, Michael Seo filed Critical Amnis Corp
Publication of WO2004066189A2 publication Critical patent/WO2004066189A2/en
Publication of WO2004066189A3 publication Critical patent/WO2004066189A3/en
Publication of WO2004066189B1 publication Critical patent/WO2004066189B1/en

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    • G01N15/10—Investigating individual particles
    • G01N15/1012—Calibrating particle analysers; References therefor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/20—Analysis of motion
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1468—Optical investigation techniques, e.g. flow cytometry with spatial resolution of the texture or inner structure of the particle
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/1012—Calibrating particle analysers; References therefor
    • G01N2015/1014—Constitution of reference particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/1012—Calibrating particle analysers; References therefor
    • G01N2015/1016—Particle flow simulating, e.g. liquid crystal cell
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    • G01N15/10—Investigating individual particles
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    • G01N15/1434—Optical arrangements
    • G01N2015/144—Imaging characterised by its optical setup
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    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
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    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G01N2015/1447—Spatial selection
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    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
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    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
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Abstract

When utilized in a flow imaging instrument, calibration beads provide a known data source that can be employed in various self diagnostic, calibration, and quality metric applications for the both the optical system of the flow imaging instrument, as well as the flow cell of the flow imaging instrument. Such data can be used to determine point spread functions associated with an imaging system, to determine a sensitivity of an imaging system, and to determine a focal point of the imaging system. Imagery collected from calibration beads can be used to determine core size and stability and TDI/flow speed synchronization. Calibration beads can be beneficially employed to enable stable system operation, even when very low sample concentration, or very small sample sizes are to be analyzed.

Claims

64AMENDED CLAIMS[Received by the International Bureau on 17 August 2004 ( 17.08.04 ): original claim 1 amended; new claims 2 - 59 added (21 pages)]The invention in which an exclusive right is claimed is defined by the following:
1. A method for using an engineered sample of calibration objects to enhance the performance of a flow imaging system configured to obtain images of sample objects entrained in a flow of fluid passing through the flow imaging system, using a time-delay-integration (TDI) detector, comprising the steps of:
(a) providing an engineered sample of calibration objects that enables a reliable data signal to be obtained during each update cycle of the flow imaging system, each calibration object being sufficiently small so as to readily pass through the fluidics of the flow imaging system;
(b) introducing the engineered sample of calibration objects into the flow of fluid passing through the flow imaging system;
(c) using the flow imaging system to collect data corresponding to the engineered sample of calibration objects, the data enabling the flow imaging system to reach and maintain a stable state, the data including velocity data that are used to synchronize the TDI detector to the flow of fluid passing through the flow imaging system, the data further including diagnostic data indicating whether the flow imaging system is functioning as desired; and
(d) introducing a sample objects into the flow of fluid passing through the flow imaging system, whereby synclironization of the TDI detector to the flow of fluid passing through the flow imaging system that is facilitated by the engineered sample of calibration objects enhances the ability of the flow imaging system to collect data corresponding to the sample objects. 65
2. A method for using calibration objects to enhance the performance of a flow imaging system configured to obtain images of sample objects entrained within a flow of fluid passing through the flow imaging system using a time-delay- integration (TDI) detector, comprising the steps of:
1 (a) introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system;
(b) modulating light from the plurality of calibration objects using an optical grating to produce modulated light having a modulation frequency that varies as a function of the velocity of the flow of fluid;
(c) using the modulated light to determine the velocity of the fluid;
(d) using the velocity to synchronize the TDI detector to the flow of fluid passing through the flow imaging system; and
(e) using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system.
3. The method of Claim 2, wherein the diagnostic check is performed under at least one of the following conditions:
(a) before sample objects are introduced in the flow of fluid;
(b) while sample objects are introduced in the flow of fluid; and
(c) after sample objects have been introduced in the flow of fluid.
4. The method of Claim 2, wherein:
(a) at least some of the calibration objects are fluorescently labeled; and
(b) the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises the step of using spectral data collected from the calibration objects to calibrate the flow imaging system. 66
5. The method of Claim 2, wherein the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises at least two of the following steps:
(a) determining a point spread function associated with optical components of the flow imaging system;
(b) determining if the flow imaging system is properly focused;
(c) determining if an axis of the flow of fluid is properly aligned relative to the flow imaging system; and
(d) determining if the TDI detector is synchronized to the flow of fluid.
6. The method of Claim 2, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of introducing calibration objects that range from about 1 micron in diameter to about 10 microns in diameter.
7. The method of Claim 2, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of introducing at least one of the following calibration object sets:
(a) a first calibration object set comprising:
(i) a plurality of calibration objects of relatively smaller size, the relatively smaller size having been selected to enhance the determination of the point spread function; and
(ii) a plurality of calibration objects of relatively larger size, the relatively larger size having been selected to enhance the determination of the velocity of the flow of fluid; and 67
(b) a second calibration object set comprising:
(i) a plurality of calibration objects of that have been fluorescently labeled, the fluorescent labels having been selected to facilitate calibration of the flow imaging system; and
(ii) a plurality of calibration objects having a specified size, the specified size having been selected to enhance the determination of the velocity of the flow of fluid.
8. A method for using calibration objects to enhance the performance of a flow imaging system configured to obtain images of sample objects entrained within a flow of fluid passing through the flow imaging system using a time-delay- integration (TDI) detector, comprising the steps of:
(a) introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system;
(b) using data collected by the flow imaging system corresponding to the calibration objects to determine a velocity of the flow of fluid;
(c) using the velocity to synchronize the TDI detector to the flow of fluid; and
(d) using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system.
9. The method of Claim 8, wherein the diagnostic check is performed before sample objects are introduced in the flow of fluid.
10. The method of Claim 8, wherein the diagnostic check is performed while sample objects are introduced in the flow of fluid.
11. The method of Claim 8, wherein the diagnostic check is performed after sample objects have been introduced in the flow of fluid. 68
12. The method of Claim 8, wherein the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises the step of determining a point spread function associated with optical components of the flow imaging system.
•13. The method of Claim 12, further comprising the step of adjusting the optical components of the flow imaging system to achieve a desired point spread function.
14. The method of Claim 8, wherein:
(a) at least some of the calibration objects are fluorescently labeled; and
(b) the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises the step of using spectral data collected from the calibration objects to calibrate the flow imaging system.
15. The method of Claim 8, wherein the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises at least one of the following steps:
(a) determining if the flow imaging system is properly focused;
(b) determining whether the flow of fluid is aligned with the desired axis within the flow imaging system; and
(c) determining if the TDI detector is synchronized to the flow of fluid.
16. The method of Claim 15, wherein the step determining whether the flow of fluid is aligned with the desired axis within the flow imaging system comprises the step of comparing the lateral positions of a plurality of images of different calibration objects obtained by the TDI detector.
17. The method of Claim 15, wherein the step determining whether the TDI detector is synchronized to the flow of fluid comprises the step of analyzing a plurality of images of different calibration objects obtained by the TDI detector, elongated and shortened images being indicative of insufficient synchronization.
18. The method of Claim 8, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of introducing calibration objects that range from about 1 micron in diameter to about 10 microns in diameter.
19. The method of Claim 8, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of introducing:
(a) a plurality of calibration objects of that have been fluorescently labeled, the fluorescent labels having been selected to facilitate calibration of the flow imaging system; and
(b) a plurality of calibration objects having a specified size, the specified size having been selected to enhance the detem ination of the velocity of the flow of fluid.
20. The method of Claim 8, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of introducing:
(a) a plurality of calibration objects of relatively smaller size, the relatively smaller size having been selected to enhance the determination of the point spread function; and
(b) a plurality of calibration objects of relatively larger size, the relatively larger size having been selected to enliance the determination of the velocity of the flow of fluid.
21. The method of Claim 20, wherein the relatively smaller size calibration objects have been selected as a function of optical characteristics of the flow imaging system and a pixel size of the TDI detector, such that images of individual calibration objects of the relatively smaller size collected by the TDI detector are substantially confined to a single pixel.
22. The method of Claim 20, wherein the relatively larger size calibration objects have been selected to fall within a range of about 1 micron to about 10 microns in diameter, and the relatively smaller size calibration objects have been selected to fall within a range of about 200 nanometers to about 500 nanometers in diameter .
23. The method of Claim 8, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of introducing at least some calibration objects having a first size range that is selected as a function of optical characteristics of the flow imaging system and a pixel size of the TDI detector, such that images of individual calibration objects of the first size range collected by the TDI detector are substantially confined to a single pixel.
24. The method of Claim 8, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the steps of:
(a) determining a flow rate of calibration objects required to ensure at least one calibration object is imaged by the TDI detector per update cycle; and
(b) substantially providing the flow rate of calibration objects so determined. 71
25. The method of Claim 8, wherein:
(a) the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the steps of:
(i) establishing a flow of a sheath fluid through the flow imaging system; and
(ii) establishing a flow of a core fluid through the flow imaging system, the calibration objects being entrained within the core fluid; and
(b) the step of the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises the step determining whether the core fluid is hydrodynamically focused by the sheath fluid.
26. The method of Claim 8, wherein the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system comprises the step of selecting a desired size of the calibration objects as a function of a size of sample objects to be analyzed, such that the desired size of each calibration object is relatively larger than the size of the sample objects, and as a consequence, while the sample objects are being analyzed by the flow imaging system, the relatively larger size calibration objects enable the velocity of the flow of fluid to be determined, ensuring that the TDI detector remains synchronized to the flow of fluid passing through the flow imaging system.
27. The method of Claim 8, further comprising the step of introducing a plurality of sample objects entrained in a flow of fluid into the flow imaging system, such that images of the sample objects incident on the TDI detector are enhanced due to the synclironization of the TDI detector to the flow of fluid passing through the flow imaging system. 72
28. The method of Claim 27, wherein the step of introducing a plurality of sample objects entrained in a flow of fluid into the flow imaging system is performed after the step of introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system, such that the plurality of calibration objects facilitate the synchronization of the TDI detector to the flow of fluid before the sample objects are introduced.
29. The method of Claim 28, wherein the introduction of the plurality of calibration objects is terminated when the plurality of sample objects are introduced.
30. The method of Claim 28, wherein the plurality of sample objects are entrained in a sample fluid, and the plurality of calibration objects are entrained in a calibration fluid, and the step of introducing a plurality of sample objects entrained in a flow of fluid into the flow imaging system comprises the step of maintaining a total volumetric flow of fluid through the flow imaging system constant, such that any increase in volumetric fluid flow attributable to introduction of the sample fluid is offset by a corresponding reduction in a volumetric fluid flow of the calibration fluid.
31. The method of Claim 27, wherein the step of introducing a plurality of sample objects entrained in a flow of fluid into the flow imaging system is performed concurrently with the introduction of the plurality of calibration objects.
32. The method of Claim 31 , wherein the plurality of sample objects and the plurality of calibration obj ecf s are entrained in the same flow of fluid.
73
33. A method for using calibration beads to enliance the performance of a flow imaging system configured to obtain images of sample objects entrained within a flow of fluid passing through the flow imaging system using a time-delay- integration (TDI) detector, comprising the steps of:
(a) establishing a flow of sheath fluid within the flow imaging system;
(b) establishing a flow of core fluid within the flow imaging system, the flow of core fluid including a plurality of calibration beads, said flow of core fluid being surrounded by the flow of sheath fluid;
(c) using data collected by the flow imaging system corresponding to the calibration beads to determine a velocity of the flow of core fluid;
(d) using the velocity to synchronize the TDI detector to the flow of core fluid within the flow imaging system; and
(e) using data collected by the flow imaging system con-esponding to the calibration beads to perform a diagnostic check on the flow imaging system.
34. The method of Claim 33, wherein the diagnostic check is performed under at least one of the following conditions:
(a) before sample objects are introduced in the flow of core fluid;
(b) while sample objects are introduced in the flow of core fluid; and
(c) after sample objects have been introduced in the flow of core fluid. 74
35. The method of Claim 33, wherein the step of using data collected by the flow imaging system corresponding to the calibration beads to perform a diagnostic check on the flow imaging system comprises at least two of the following steps:
(a) determining a point spread function associated with optical components of the flow imaging system;
(b) determining if the flow imaging system is properly focused;
(c) determining if an axis of the flow of core fluid is properly aligned relative to the flow imaging system;
(d) determining if the TDI detector is synchronized to the flow of fluid; and
(e) when at least some of the calibration beads are fluorescently labeled, using spectral data collected from the calibration beads to calibrate the flow imaging system.
36. A flow imaging system adapted to determine an indication of a velocity and at least one additional characteristic of a plurality of objects, from images of the plurality of objects, while there is relative movement between the plurality of objects and the flow imaging system, comprising:
(a) a fluidic subsystem configured to selectively introduce a fluid in which the plurality of objects are entrained into a field of view, the plurality of objects including at least one of a plurality of calibration objects and a plurality of sample objects;
(b) an optical subsystem configured to convey light from the plurality of objects passing through the field of view;
(c) a velocity measurement subsystem configured to receive the light conveyed by the optical subsystem, and to manipulate said light to determine an indication of the velocity of the relative movement between the plurality of objects and the flow imaging system; 75
(d) a time-delay-integration (TDI) detector configured to receive the light obtained by the optical subsystem, said TDI detector being coupled to said velocity measurement subsystem, said TDI detector employing a timing signal produced by the velocity measurement subsystem to produce an output signal that is indicative of said at least one additional characteristic of the plurality of objects; and
(e) a control circuit logically coupled with the TDI detector, the control circuit configured to implement a plurality of functions, including using data collected by the flow imaging system corresponding to the plurality of calibration objects to perform at least one diagnostic check on the flow imaging system.
37. The flow imaging system of Claim 36, wherein said control circuit is further configured to implement the function of performing the at least one diagnostic check under at least one of the following conditions:
(a) before sample objects are introduced in the flow of fluid;
(b) while sample objects are introduced in the flow of fluid; and
(c) after sample obj ects have been introduced in the flow of fluid.
38. The flow imaging system of Claim 36, wherein the at least one diagnostic check the control circuit is configured to implement comprises at least two of the following diagnostic checks:
(a) determining a point spread function associated with optical components of the flow imaging system;
(b) determining if the flow imaging system is properly focused;
(c) determining if an axis of the flow of fluid is properly aligned relative to the flow imaging system;
(d) determining if the TDI detector is synchronized to the flow of fluid; and
(e) when at least some of the plurality of calibration objects are fluorescently labeled, using spectral data collected from the plurality of calibration objects to calibrate the flow imaging system. 76
39. The flow imaging system of Claim 36, wherein said fluidic subsystem comprises a syringe pump coupled with a fluid supply including a fluid into which a plurality of sample objects and a plurality of calibration objects are entrained.
40. The flow imaging system of Claim 36, wherein said fluidic subsystem comprises:
(a) a first syringe pump coupled to a sample fluid supply volume configured to provide a supply of a sample fluid into which a plurality of the sample objects are entrained; and
(b) a second syringe pump coupled a calibration fluid supply volume configured to provide a supply of a calibration fluid into which a plurality of the calibration objects are entrained.
41. The flow imaging system of Claim 40, wherein said control circuit is controllably coupled to the fluidic subsystem and is further configured to implement the functions of:
(a) activating the fluidic subsystem so that a flow of calibration fluid is established witliin the field of view, thus enabling the velocity measurement subsystem to provide the timing signal to the TDI detector; and
(b) activating the fluidic subsystem so that a flow of sample fluid is established within the field of view if the diagnostic check indicates that the flow imaging system is ready to analyze the sample objects.
42. The flow imaging system of Claim 40, wherein:
(a) the fluidic subsystem further comprises a sheath fluid supply volume configured to provide a supply of a sheath fluid;
(b) the control circuit is further configured to activate the fluidic subsystem so that a flow of sheath fluid is established within the field of view before the calibration fluid is introduced into the field of view; and 77
(c) the diagnostic check implemented by the control circuit compares a plurality of images of calibration objects incident upon the TDI detector to determine if the relative lateral positions of the plurality of images of the calibration objects indicate that the flow of calibration fluid in the field of view is properly hydrodynamically focused by the sheath fluid.
43. The flow imaging system of Claim 40, wherein the control circuit maintains the flow of fluid through the field of view at a constant volumetric flow rate, such that any increase in the volumetric flow rate attributable to introduction of the sample fluid into the field of view is offset by a corresponding reduction in a volumetric flow rate of the calibration fluid into the field of view.
44. The flow imaging system of Claim 36, wherein said velocity measurement subsystem comprises:
(a) an optical grating disposed to receive the light conveyed by the optical subsystem, said optical grating modulating the light, producing modulated light that has a modulation frequency corresponding to a velocity of the relative movement between the plurality of objects and the flow imaging system;
(b) a light sensitive detector disposed to receive the modulated light, said light sensitive detector producing an electrical signal in response to the modulated light; and
(c) means coupled to the light sensitive detector to receive the electrical signal, for determining an indication of the velocity of the relative movement between the object and the flow imaging system as a function of the electrical signal and for producing a timing signal as a function of said indication of the velocity. 78
45. The flow imaging system of Claim 36, wherein the control circuit comprises at least one of:
(a) processor coupled to a memory, said memory storing machine instructions that are executed by the processor to implement the plurality of functions; and
(b) an application specific integrated circuit.
46. A flow imaging system adapted to determine an indication of a velocity and at least one additional characteristic of a plurality of objects, from images of the plurality of objects, while there is relative movement between the plurality of objects and the flow imaging system, comprising:
(a) a fluidic subsystem configured to selectively introduce a fluid into which the plurality of objects are entrained into a field of view, the plurality of objects including at least one of calibration objects and sample objects;
(b) an optical subsystem configured to convey light from the plurality of objects passing through the field of view;
(c) a velocity measurement subsystem configured to receive the light conveyed by the optical subsystem and to produce a signal indicative of the velocity of the relative movement between the plurality of objects and the flow imaging system;
(d) a time-delay-integration (TDI) detector configured to receive the light conveyed by the optical subsystem, said TDI detector producing an output signal that is indicative of said at least one additional characteristic of the object; and
(e) a control circuit logically coupled with the velocity measurement subsystem and the TDI detector, the control circuit implementing a plurality of functions, including:
(i) using the signal indicative of the velocity to synchronize the TDI detector to the flow of fluid passing through the flow imaging system; and
(ii) using the output signal to perform at least one diagnostic check on the flow imaging system. 79
47. The flow imaging system of Claim 46, wherein said control circuit is further configured to use the output signal to perform at least one diagnostic check on the flow imaging system under at least one of the following conditions:
(a) before sample objects are introduced in the flow of fluid;
(b) while sample objects are introduced in the flow of fluid; and
(c) after sample objects have been introduced in the flow of fluid.
48. The flow imaging system of Claim 46, wherein the at least one diagnostic check the control circuit is configured to implement comprises at least two of the following diagnostic checks:
(a) determining a point spread function associated with optical components of the flow imaging system;
(b) determining if the flow imaging system is properly focused;
(c) detennining if an axis of the flow of fluid is properly aligned relative to the flow imaging system;
(d) detennining if the TDI detector is synchronized to the flow of fluid; and
(e) when at least some of the calibration beads are fluorescently labeled, using spectral data collected from the calibration beads to calibrate the flow imaging system.
80
49. A flow imaging system adapted to determine an indication of a velocity and at least one additional characteristic of an object, from images of the object, while there is relative movement between the object and the imaging system, comprising:
(a) a fluidic subsystem configured to selectively introduce a fluid into which at least one type of object is entrained into a field of view, the fluid system comprising:
(i) a sample fluid supply volume configured to provide a supply of a sample fluid in which a plurality of sample objects are entrained;
(ii) a calibration fluid supply volume configured to provide a supply of a calibration fluid in which a plurality of calibration objects are entrained;
(b) an optical subsystem configured to convey light from an object passing through the field of view;
(c) a velocity measurement subsystem configured to receive the light conveyed by the optical subsystem, and to manipulate said light to determine the indication of the velocity of the relative movement between the object and the flow imaging system;
(d) a time-delay-integration (TDI) detector configured to receive the light conveyed by the optical subsystem, said TDI detector producing an output signal that is indicative of said at least one additional characteristic of the object; and
81
(e) a control circuit controllably coupled with the fluidic subsystem and logically coupled with the TDI detector, the control circuit implementing a plurality of functions, including:
(i) activating the fluidic subsystem so' that a flow of the calibration fluid is established within the field of view, thus enabling the velocity measurement subsystem to continuously determine the indication of velocity;
(ii) using data collected by the flow imaging system corresponding to the calibration beads to perfomi at least one diagnostic check on the flow imaging system; and
(iii) activating the fluidic subsystem so that a flow of sample fluid is established witliin the field of view, such that images of the sample objects incident on the TDI detector are enhanced due to a synchronization of the TDI detector to the flow of fluid passing through the flow imaging system enabled by the indication of velocity.
50. The flow imaging system of Claim 49, wherein the control circuit is logically coupled with the velocity measurement subsystem, and the control circuit is further configured to implement the function of using the indication of velocity determined by the velocity measurement subsystem to continuously synchronize the TDI detector to the flow of fluid passing through the flow imaging system.
51. The flow imaging system of Claim 49, wherein the TDI detector is logically coupled to the velocity measurement subsystem, and is configured to use the indication of velocity determined by the velocity measurement subsystem to continuously synchronize the TDI detector to the flow of fluid passing through the flow imaging system.
52. The flow imaging system of Claim 49, wherein the control circuit is further configured to activate the fluidic subsystem so that a flow of sample fluid is established within the field of view only after the at least one diagnostic check on the flow imaging system indicates that the flow imaging system is ready to analyze sample objects. 82
- 53. The flow imaging system of Claim 49, wherein said control circuit is further configured to perform the at least one diagnostic check on the flow imaging system under at least one of the following conditions:
(a) before sample objects are introduced in the flow of fluid;
(b) while sample objects are introduced in the flow of fluid; and
(c) after sample obj ects have been introduced in the flow of fluid.
54. The flow imaging system of Claim 49, wherein the at least one diagnostic check implemented by the control circuit comprises at least one of:
(a) determining a point spread function associated with optical components of the flow imaging system;
(b) detennining if the flow imaging system is properly focused;
(c) detennining if an axis of the flow of calibration fluid is properly aligned relative to the flow imaging system;
(d) determining if the TDI detector is synchronized to the flow of calibration fluid; and
(e) when at least some of the calibration beads are fluorescently labeled, using spectral data collected from the calibration beads to calibrate the flow imaging system.
55. The flow imaging system of Claim 49, wherein the control circuit is further configured to implement the function of maintaining the flow of fluid through the field of view at a substantially constant volumetric flow rate, such that any increase in the volumetric flow rate attributable to the introduction of the sample fluid into the field of view is offset by a coreesponding reduction in a volumetric flow rate of the calibration fluid into the field of view.
56. A method for using calibration objects to enliance the performance of a flow imaging system configured to obtain images of sample objects entrained within a flow of fluid passing through the flow imaging system using a time-delay- integration (TDI) detector, comprising the steps of:
(a) introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system, such that the calibrations objects are larger in size than objects of interest to be imaged by the flow imaging system;
(b) modulating light from the plurality of calibration objects using an optical grating to produce modulated light having a modulation frequency that varies as a function of the velocity of the flow of fluid;
(c) using the modulated light to determine the velocity of the fluid;
(d) using the velocity to synchronize the TDI detector to the flow of fluid passing through the flow imaging system; and
(e) using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system, such that a size difference between the calibrations objects and the objects of interest enable data corresponding to the calibration objects to be easily discriminated from data conesponding to an object of interest.
57. A method for using calibration objects to enliance the performance of a flow imaging system configured to obtain images of sample objects entrained witliin a flow of fluid passing through the flow imaging system, comprising the steps of:
(a) introducing a plurality of calibration objects entrained in a flow of fluid into the flow imaging system, such that the calibrations objects are larger in size than objects of interest to be imaged by the flow imaging system;
(b) introducing a plurality of obj ects of interest entrained in a flow of fluid into the flow imaging system; 84
(c) using the flow imaging system to collect data corresponding to the plurality of calibration objects and the plurality of objects of interest; and
(d) separating data collected by the flow imaging system corresponding to the plurality of calibration objects from data collected by the flow imaging system corresponding to the plurality of objects of interest, based on the size difference between the calibration objects and the objects of interest.
58. The method of Claim 57, further comprising the step of using data collected by the flow imaging system conesponding to the calibration objects to perform a diagnostic check on the flow imaging system.
59. The method of Claim 57, wherein the step of using data collected by the flow imaging system corresponding to the calibration objects to perform a diagnostic check on the flow imaging system comprises at least one of the following steps:
(a) detennining a point spread function associated with optical components of the flow imaging system;
(b) determining if the flow imaging system is properly focused;
(c) determining if an axis of the flow of fluid is properly aligned relative to the flow imaging system; and
(d) determining if the TDI detector is synchronized to the flow of fluid.
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WO2004066189A2 (en) 2004-08-05
WO2004066189A3 (en) 2004-09-23
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US6906792B2 (en) 2005-06-14
US20030142289A1 (en) 2003-07-31

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